Rear lower bumper



FIG. 1 is a perspective view of a rear lower bumper showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, a left side view being a mirror image thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines shown in the drawings illustrate a portion of the rear lower bumper that forms no part of the claimed design. 

CLAIM The ornamental design for a rear lower bumper, as shown and described. 